挥舞着Jersey 2的东西会抛出java.lang.NoClassDefFoundError:javax/servlet/ServletConfig [英] Swagger with Jersey 2 throws java.lang.NoClassDefFoundError: javax/servlet/ServletConfig
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问题描述
尝试设置我的第一个REST API(使用Jersey 2和Gradle)并使用swagger向其添加一些文档.但是，当添加摇摇欲坠的依赖性并遵循
Trying to setup my first REST API (using Jersey 2 and Gradle) and add some documentation to it by using swagger. But when adding swagger dependencies and following this swagger documentation, "Using a custom Application subclass" approach, it throws me this exception, when executing the main method from Eclipse:
Exception in thread "main" java.lang.NoClassDefFoundError: javax/servlet/ServletConfig
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.getDeclaredMethods(Class.java:1975)
at org.glassfish.jersey.server.model.IntrospectionModeller$2.run(IntrospectionModeller.java:253)
at java.security.AccessController.doPrivileged(Native Method)
at org.glassfish.jersey.server.model.IntrospectionModeller.getAllDeclaredMethods(IntrospectionModeller.java:247)
at org.glassfish.jersey.server.model.IntrospectionModeller.checkForNonPublicMethodIssues(IntrospectionModeller.java:172)
at org.glassfish.jersey.server.model.IntrospectionModeller.doCreateResourceBuilder(IntrospectionModeller.java:119)
at org.glassfish.jersey.server.model.IntrospectionModeller.access$000(IntrospectionModeller.java:80)
at org.glassfish.jersey.server.model.IntrospectionModeller$1.call(IntrospectionModeller.java:112)
at org.glassfish.jersey.server.model.IntrospectionModeller$1.call(IntrospectionModeller.java:109)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.processWithException(Errors.java:255)
at org.glassfish.jersey.server.model.IntrospectionModeller.createResourceBuilder(IntrospectionModeller.java:109)
at org.glassfish.jersey.server.model.Resource.from(Resource.java:797)
at org.glassfish.jersey.server.ApplicationHandler.initialize(ApplicationHandler.java:465)
at org.glassfish.jersey.server.ApplicationHandler.access$500(ApplicationHandler.java:184)
at org.glassfish.jersey.server.ApplicationHandler$3.call(ApplicationHandler.java:350)
at org.glassfish.jersey.server.ApplicationHandler$3.call(ApplicationHandler.java:347)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.processWithException(Errors.java:255)
at org.glassfish.jersey.server.ApplicationHandler.<init>(ApplicationHandler.java:347)
at org.glassfish.jersey.server.ApplicationHandler.<init>(ApplicationHandler.java:299)
at org.glassfish.jersey.jdkhttp.JdkHttpHandlerContainer.<init>(JdkHttpHandlerContainer.java:98)
at org.glassfish.jersey.jdkhttp.JdkHttpServerFactory.createHttpServer(JdkHttpServerFactory.java:111)
at org.glassfish.jersey.jdkhttp.JdkHttpServerFactory.createHttpServer(JdkHttpServerFactory.java:93)
at example.MyApp.main(MyApp.java:21)
Caused by: java.lang.ClassNotFoundException: javax.servlet.ServletConfig
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 29 more
我的代码如下:
package example;
import static org.glassfish.jersey.jdkhttp.JdkHttpServerFactory.createHttpServer;
import java.net.URI;
import javax.ws.rs.core.UriBuilder;
import org.glassfish.jersey.jackson.JacksonFeature;
import org.glassfish.jersey.server.ResourceConfig;
import com.sun.net.httpserver.HttpServer;
import io.swagger.jaxrs.listing.ApiListingResource;
import io.swagger.jaxrs.listing.SwaggerSerializers;
public class MyApp extends ResourceConfig {
public static void main(String[] args) throws Throwable {
URI baseUri = UriBuilder.fromUri("http://localhost/").port(9999).build();
HttpServer server = createHttpServer(baseUri, new MyApp());
System.out.println("SERVICE started at: " + baseUri);
Runtime.getRuntime().addShutdownHook(new Thread(() -> {
server.stop(0);
}));
}
public MyApp() {
packages("example");
register(SwaggerSerializers.class); // <-- swagger specific
register(ApiListingResource.class); // <-- swagger specific
register(JacksonFeature.class);
}
}
我的gradle依赖项
My gradle dependencies
dependencies {
compile 'com.fasterxml.jackson.jaxrs:jackson-jaxrs-json-provider:+'
compile 'org.glassfish.jersey.containers:jersey-container-jdk-http:+'
compile 'org.glassfish.jersey.media:jersey-media-moxy:+'
compile 'org.glassfish.jersey.media:jersey-media-json-jackson:+'
compile 'io.swagger:swagger-jersey2-jaxrs:1.5.9'
}
在Windows 7上使用jdk1.8.0_77
但是，如果我在代码中注释掉了swagger依赖项和swagger细节，那么实际的REST服务将按预期工作.如何在不使用servlet容器的情况下迅速进行工作? REST服务可以在没有它的情况下工作
However, if I comment out the swagger dependency and the swagger specifics in the code, then the actual REST service works as expected. How can I make swagger work without using a servlet container? The REST service can work without it
dependencies {
compile 'com.fasterxml.jackson.jaxrs:jackson-jaxrs-json-provider:+'
compile 'org.glassfish.jersey.containers:jersey-container-jdk-http:+'
compile 'org.glassfish.jersey.media:jersey-media-moxy:+'
compile 'org.glassfish.jersey.media:jersey-media-json-jackson:+'
// compile 'io.swagger:swagger-jersey2-jaxrs:1.5.9'
}
代码:
package example;
import static org.glassfish.jersey.jdkhttp.JdkHttpServerFactory.createHttpServer;
import java.net.URI;
import javax.ws.rs.core.UriBuilder;
import org.glassfish.jersey.jackson.JacksonFeature;
import org.glassfish.jersey.server.ResourceConfig;
import com.sun.net.httpserver.HttpServer;
import io.swagger.jaxrs.listing.ApiListingResource;
import io.swagger.jaxrs.listing.SwaggerSerializers;
public class MyApp extends ResourceConfig {
public static void main(String[] args) throws Throwable {
URI baseUri = UriBuilder.fromUri("http://localhost/").port(9999).build();
HttpServer server = createHttpServer(baseUri, new MyApp());
System.out.println("SERVICE started at: " + baseUri);
Runtime.getRuntime().addShutdownHook(new Thread(() -> {
server.stop(0);
}));
}
public MyApp() {
packages("example");
// register(SwaggerSerializers.class); // <-- swagger specific
// register(ApiListingResource.class); // <-- swagger specific
register(JacksonFeature.class);
}
}
推荐答案
因此，问题似乎出在非servlet环境中.虽然Jersey支持它，但挥杆核心...不是很多.尽管不太常见，但这给特定的部署带来了一些问题.
So it looks like the issue is derived from you running in a non-servlet environment. While Jersey supports it, swagger-core... not so much. This poses some issues with specific deployment, although they are less common.
很显然，最简单的解决方案是使用servlet容器引擎.像Jetty这样的轻量级产品也可以.
The easiest solution would, obviously, be to use a servlet-container engine. Something lightweight like Jetty would work.
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